Quote:
Originally Posted by wwest
This last sentence is misleading, maybe terribly so. All 12 volt devices will be powered by the 12 volt buss, itself primarily powered by the 12 volt battery with the DC-to-DC down converter serving only as backup when the battery is sub-standardly charged.
All things considered I doubt of the down converter supply capability will be much more than the expected FULL twelve volt load current plus a little to provide for a reasonable battery recharge rate.
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Willard, I'm 100% sure about this, and I would like you to perhaps edit your post to delete the part that may confuse novice readers. Then I'll delete this to tidy up.
With 100% certainty, once the 12v battery closes the contacts on the HV battery, the HV battery, via DC/DC stepdown converter
powers everything. I'm 100% sure about this, it has been tested and proven correct time and time again.
The proof is in the pudding, and electrons, like water, only flow downhill.
A 12v battery at rest under the hood has 12.5 to 13 volts.
AS SOON AS the HV battery contacts close, the DC/DC converter applies 14.4 volts to the "buss" as you put it.
Since this voltage potential is higher than the 12v battery potential, amperage may only flow into the battery, not out of it. And funny thing.... if you park with your headlamps on ( key in run ), the HV battery loses state of charge, and the 12v battery does not. The 12v battery can act like a capacitor to take out spikes in power demand, the inrush of current that happens like the instant you switch a load, like the fan on. Is the Prius substantially different in this regard?
Thanks.